Surface Specularity as an Indicator of Shock-Induced Solid-Liquid Phase Transitions

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When highly polished metal surfaces melt upon release after shock loading, they exhibit a number of features that suggest that significant surface changes accompany the phase transition. The reflection of light from such surfaces changes from specular (pre-shock) to diffuse upon melting. A familiar manifestation of this phenomenon is the loss of signal light in velocimetric measurements typically observed above pressures high enough to melt the free-surface. Unlike many other potential material phase-sensitive diagnostics (e.g., reflectometery, conductivity), changes in the specularity of reflection provide a dramatic, sensitive indicator of the solid-liquid phase transition. Data will be presented from multiple diagnostics ... continued below

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Gerald Stevens, Stephen Lutz, William Turley, Lynn Veeser June 29, 2007.

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When highly polished metal surfaces melt upon release after shock loading, they exhibit a number of features that suggest that significant surface changes accompany the phase transition. The reflection of light from such surfaces changes from specular (pre-shock) to diffuse upon melting. A familiar manifestation of this phenomenon is the loss of signal light in velocimetric measurements typically observed above pressures high enough to melt the free-surface. Unlike many other potential material phase-sensitive diagnostics (e.g., reflectometery, conductivity), changes in the specularity of reflection provide a dramatic, sensitive indicator of the solid-liquid phase transition. Data will be presented from multiple diagnostics that support the hypothesis that specularity changes indicate melt. These diagnostics include shadowgraphy, infrared imagery, high-magnification surface images, interferometric velocimetry, and most recently scattering angle measurements.

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  • Journal Name: American Physical Society, 15th APS Topical Conference on Shock Compression of Condensed Matter, June 24-29,2007; Conference: 2007 Shock Compression of Condensed Matter American Physical Society Conference, Hawaii, June 23-29, 2007

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  • Report No.: DOE/NV/25946--126
  • Grant Number: DE-AC52-06NA25946
  • Office of Scientific & Technical Information Report Number: 946607
  • Archival Resource Key: ark:/67531/metadc899601

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  • June 29, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 16, 2016, 12:52 p.m.

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Gerald Stevens, Stephen Lutz, William Turley, Lynn Veeser. Surface Specularity as an Indicator of Shock-Induced Solid-Liquid Phase Transitions, article, June 29, 2007; United States. (digital.library.unt.edu/ark:/67531/metadc899601/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.